When I turned back,I found the boy‘s eyes---- on the window.

When I turned back,I found the boy‘s eyes____ on the window.A.fixing B.to fix C.are fixed D.fixed
选D
首先确定填的是非谓语
因为句中已经有谓语动词found了
其次,因为词组是【be fixed with】所以用过去分词表示被动